Device for concentrating high-flow-rate gaseous substances and gaseous substance processing device comprising same

Abstract

The present invention relates to a device for concentrating a volatile organic compound and an exhaust gas processing device for processing same. Provided is a concentration device for concentrating gaseous substances. The concentration device includes: an adsorption member forming multiple functional regions for adsorbing, concentrating, and desorbing gaseous substances in exhaust gas discharged from an exhaust source; and a driving unit for relatively rotating the adsorption member with respect to the gaseous substances, wherein the multiple functional regions of the adsorption member include an adsorption region, a desorption region, and a cooling region. The concentration device includes: an exhaust gas flow path flowing from the exhaust source into the adsorption region; a desorption gas flow path for discharging a concentrated gas from the desorption region; a cooling gas flow path flowing into the cooling region; and a recirculation flow path branching from the desorption gas flow path, wherein a part of the concentrated gas from the desorption gas flow path joins the exhaust gas flow path through the recirculation flow path or joins the desorption gas flow path flowing into the desorption region.

Description

A large-volume gaseous substance concentration device and a gaseous substance processing device including the same

[0001] The present invention relates to a device for concentrating and processing gaseous substances such as odors, carbon dioxide, and volatile organic compounds, and more specifically, to a gaseous substance processing device for concentrating low-concentration gaseous substances discharged from air purifiers, printing processes, painting processes, semiconductor processes, carbon dioxide emission facilities, and odor facilities, and desorbing them by using a rotating rotor, condensing, recovering, and removing them.

[0002] As legal regulations on the atmospheric environment strengthen, it is becoming increasingly difficult to oxidize gaseous substances containing volatile organic compounds using heat or catalysts. Typically, these gases contain a small amount of combustible components, making oxidation systems utilizing high temperatures above 800°C or catalysts above 300°C uneconomical due to the high energy consumption. Therefore, regenerative thermal combustion, which utilizes thermal storage media to recover heat at a rate of over 95%, is widely used to treat low-concentration volatile organic compounds. Regenerative thermal combustion maintains an oxidation temperature above 800°C to oxidize volatile organic compounds at high temperatures. Typically, operation is possible without additional fuel when the temperature rise due to the oxidation calorific value of volatile organic compounds in the gaseous substance is 40-80°C per cubic meter of gas. However, when the temperature rise is below 40°C per cubic meter of gas, additional fuel is required. In the regenerative thermal combustion method, the regenerative thermal combustion method using a catalyst is called the regenerative catalytic combustion method, and it can be processed more economically because the combustion temperature can be lowered to 300 to 450℃. However, even in this case, if the calorific value per cubic meter of gas of the volatile organic compounds contained in the gaseous substance does not reach 15 to 30℃, a lot of additional energy is consumed. In the actual painting process, gaseous substances containing odors and volatile organic compounds are often environments where low concentrations of volatile organic compounds are emitted due to high air volumes. Therefore, in order to combust and oxidize low concentrations of odors and volatile organic compounds, additional fuel must be added, and this has the disadvantage of requiring high energy consumption and annual maintenance costs of hundreds of millions of won.

[0003] As a method for processing existing low-concentration gaseous substances, Japanese Patent Application Laid-Open No. 1997-173758 provides a high-boiling-point solvent recovery device comprising a honeycomb structure rotor supporting an adsorbent, a separator dividing the vicinity of the cross-section of the rotor into two regions, an adsorption region and a desorption region, a blower supplying solvent-containing air having a boiling point of 150 to 300°C to the adsorption region, releasing a portion of the purification gas flowing out from the opposite cross-section of the rotor into the atmosphere and supplying the remainder to the desorption region, a heating means for heating the purification gas, a cooling means for separating the solvent-enriched gas into a liquefied recovery product and a cooled lean gas, and a return means for returning the cooled lean gas as a raw material. This device can concentrate by a concentration multiple of 5 to 15 times. In such a conventional adsorption concentration device, an adsorbent such as zeolite, activated carbon, or silica is coated on a honeycomb-shaped ceramic support, and the concentration multiple is determined by the adsorption amount of the substance.

[0004] Meanwhile, Korean Patent No. 2383095 provides a concentrating device for concentrating a gaseous substance, including an adsorption member forming a plurality of functional areas for adsorbing, concentrating, and desorbing pollutants in a gas, and a driving unit for relatively rotating the adsorption member with respect to the gaseous substance, wherein a portion of the concentrated gas in the desorption gas path flows into the adsorption region through the recirculation path. However, although this method has the advantage of concentrating the concentrated recirculated gas to a high concentration by introducing it into the adsorption region, thereby reducing the capacity of the post-treatment system, there is a concern that the efficiency may be lowered because more adsorption members are required to re-adsorb the pollutants concentrated to a high concentration, and there is a problem that additional energy is required to desorb the pollutants adsorbed to a high concentration.

[0005] In order to solve the problems of the above-mentioned prior art, the present invention aims to provide a gaseous substance treatment system capable of saving energy and effectively removing gaseous substances by concentrating gaseous substances to a high concentration from an emission source containing and emitting gaseous substances of a large air volume and low concentration and using the same in combustion, recovery and condensation treatment means.

[0006] In addition, the present invention aims to provide a gaseous substance processing system that concentrates a gaseous substance to a high concentration while suppressing an increase in desorption energy by using a concentrating means composed of a plurality of functional regions including an adsorption region, a desorption region, and a cooling region.

[0007] In addition, the present invention aims to provide a gaseous substance processing system capable of concentrating a gaseous substance to a high concentration without re-adsorption in an adsorption region by using a concentrating means composed of a plurality of functional regions including an adsorption region, a desorption region, and a cooling region.

[0008] In addition, the purpose is to provide a gaseous substance treatment system that can stably supply the flow rate, concentration and temperature of the cooling stream, the flow rate and concentration of the desorption stream, and the energy required for desorption while appropriately controlling the recirculation rate required for high-concentration concentration and taking into consideration the safety and convenience of the operator.

[0009] In order to achieve the above technical problem, the present invention provides a gaseous substance concentrating device comprising an adsorption member forming a plurality of functional regions for adsorbing and concentrating and desorbing gaseous substances in an exhaust gas discharged from an emission source, and a driving unit for relatively rotating the adsorption member with respect to the gaseous substances, wherein the plurality of functional regions of the adsorption member include an adsorption region, a desorption region, and a cooling region, and the concentrating device comprises an exhaust gas path flowing into the adsorption region from the emission source, a desorption gas path discharging a concentrated gas from the desorption region, a cooling gas path flowing into the cooling region, and a recirculation path branching from the desorption gas path, wherein a portion of the concentrated gas in the desorption gas path joins the exhaust gas path through the recirculation path.

[0010] In the present invention, another portion of the concentrated gas in the desorption gas path may join the cooling gas path flowing into the cooling region. At this time, another portion of the concentrated gas in the desorption gas path may join the desorption gas path flowing into the desorption region.

[0011] In order to achieve the above technical task, the present invention provides a gaseous substance concentrating device comprising an adsorption member forming a plurality of functional regions for adsorbing and concentrating and desorbing gaseous substances in an exhaust gas discharged from an emission source, and a driving unit for relatively rotating the adsorption member with respect to the gaseous substances, wherein the plurality of functional regions of the adsorption member include an adsorption region, a desorption region, and a cooling region, and the concentrating device comprises an exhaust gas path flowing into the adsorption region from the emission source, a desorption gas path discharging a concentrated gas from the desorption region, a cooling gas path flowing into the cooling region, and a recirculation path branching from the desorption gas path, wherein a portion of the concentrated gas in the desorption gas path joins the desorption gas path flowing into the desorption region through the recirculation path.

[0012] In the present invention, another portion of the concentrated gas of the desorption gas path can join the exhaust gas path.

[0013] In the present invention, the functional area of ​​the adsorption member may further include a purge area, and may further include a purge path for introducing purge gas into the purge area.

[0014] In the present invention, the purge gas may include outside air, exhaust gas, or purified exhaust gas.

[0015] In the present invention, the external air may include atmosphere, air with controlled oxygen concentration, carbon dioxide, nitrogen, or an inert gas.

[0016] In the present invention, the recirculating flow path may be provided with a cooling means.

[0017] Additionally, in the present invention, a cooling means may be provided in the desorption gas path.

[0018] According to the present invention, a gaseous substance of low concentration with a large air volume is adsorbed using a concentrating means having a plurality of functional areas, and a portion of the desorbed concentrated gas is recycled using a heat source to concentrate the low-concentration gaseous substance to a high concentration, and this is used in a combustion, recovery and condensation treatment means, thereby saving energy and effectively removing the gaseous substance.

[0019] According to the present invention, it is possible to minimize the increase in energy required for desorption even though a gaseous substance is concentrated by recycling a portion of the desorbed gas that is adsorbed and desorbed in a concentrating means.

[0020] In addition, according to the present invention, a portion of the high-concentration gas adsorbed and desorbed in the concentration means is recycled, and the concentration rate of the gaseous substance is improved by concentrating it to a high concentration without re-adsorption in the adsorption area.

[0021] Accordingly, the concentration ratio can be increased by up to 300 times, minimizing the size of the final treatment means and allowing more economical treatment of gaseous substances.

[0022] FIG. 1 is a schematic drawing of a concentrating device for highly concentrating and processing a gaseous substance according to one embodiment of the present invention.

[0023] Figure 2 is a conceptual drawing illustrating that a cross-section of an adsorption member of a concentration device is divided into multiple functional areas.

[0024] FIG. 3 is a schematic diagram showing a first embodiment of a gaseous substance processing device according to one embodiment of the present invention.

[0025] FIG. 4 is a schematic diagram showing a second embodiment of a gaseous substance processing device according to one embodiment of the present invention.

[0026] FIG. 5 is a schematic diagram showing a third embodiment of a gaseous substance processing device according to one embodiment of the present invention.

[0027] FIG. 6 is a schematic diagram showing a fourth embodiment of a gaseous substance processing device according to one embodiment of the present invention.

[0028] The present invention will be described in detail with reference to the drawings below.

[0029] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. In describing the present invention, detailed descriptions of related known structures or functions will be omitted if they are deemed to obscure the gist of the present invention.

[0030] In the following specification of the present invention, gaseous substances include not only volatile organic compound components such as organic solvents such as toluene and NMP (N-Methyl-2-pyrrolidone), but also pollutants such as odor components, CO2, NO x It is used as a term to refer to all harmful substances such as water vapor. In addition, the term "gaseous substance" in the specification of the present invention may include water vapor.

[0031] Therefore, in the specification of the present invention, the gaseous substance may have different components depending on the type of gaseous substance, for example, it may refer to only an odor component, may refer to a gaseous substance component, or may refer to both an odor component and other harmful components.

[0032]

[0033] FIG. 1 is a side view schematically illustrating a concentration device according to one embodiment of the present invention.

[0034] Referring to FIG. 1, the concentrator (100) may include an adsorption member (10 in FIG. 2) forming a plurality of functional areas for adsorbing and concentrating / desorbing a gaseous substance, and a driving unit for relatively rotating the adsorption member with respect to the gaseous substance.

[0035] The above-described concentrator (100) provides a plurality of gas paths. As illustrated, suitable paths are provided to provide, for example, an exhaust gas flow (①) from a pollutant (or emission source) penetrating the internal adsorption member, a desorption gas flow (③) that desorbs adsorbed gaseous substances, and a cooling gas flow (②) for cooling a region of the adsorption member that has been heated after desorption. In addition, suitable paths are provided so that a portion of the desorption gas flow (③) branches off as a recirculation flow (④) and joins the cooling gas flow (②), and another portion is discharged as an exhaust flow (⑤).

[0036] In the present invention, various sources may be used as the supply source (⑥) of the cooling gas. For example, outside air, exhaust gas from a pollutant, or purified gas may be used. Here, outside air may include clean atmospheric air, air with controlled oxygen concentration, or, in the case of combustible materials in the form of gases, inert gases such as non-reactive nitrogen, carbon dioxide, and helium.

[0037] In addition, in the present invention, the concentrator (100) may be provided with appropriate gaseous substance transfer means, sensors, gas inlets, gas outlets, and a housing. In addition, appropriate valves, ducts, and blower means for branching the recirculation flow and the exhaust flow may be provided. In addition, in the present invention, a plurality of passages penetrating the adsorption member are separated and / or partitioned by appropriate sealing means so that the gas flows therethrough do not interfere with each other. For example, by arranging a silicone resin, a heat-resistant polymer, or a metal or ceramic material between the housing and the adsorption member, the gas flow flowing through each passage can be separated and partitioned.

[0038] Meanwhile, as illustrated in Fig. 1, the cooling gas flow (②) that has passed through the cooling area (C) is further heated through the desorption means (200) and flows into the desorption area (D). The desorption means (200) of the present invention may be implemented as a part of the concentrating device (100) or may be implemented as a separate, separate component.

[0039] Figure 1 illustrates exemplary directions of gas flow in gas paths (①, ②, ③), but the present invention is not limited thereto. At least one of the gas flows in each path may have a direction opposite to that illustrated.

[0040] The concentrator of Fig. 1 can use a cylindrical adsorption member (10) as in Fig. 2 as an adsorption concentration means for a gaseous substance.

[0041] The above-described adsorption member (10) may be formed of an appropriate material having heat storage properties and gas adsorption properties. In general, the adsorption member may be used by coating an adsorbent having excellent adsorption properties on a base material made of ceramic fiber, glass fiber, or aluminum or stainless steel plate folded. Of course, the present invention is not limited thereto, and the adsorption member (10) may be formed of one material selected from the group consisting of zeolite such as 3A, 4A, USY, or ZSM-5, MOF (metal organic framework), activated carbon, activated carbon fiber, CNT (carbon nanotube), graphene, alumina, silica, and polymer resin, or a composite material of the selected materials.

[0042] In addition, the above adsorption member may be a rechargeable one using a spherical adsorbent, an amorphous adsorbent, a cylindrical adsorbent, and a honeycomb-shaped adsorbent, or a honeycomb-shaped adsorption member formed into a laminated adsorbent using a folded, extruded, or sheet-shaped adsorbent to improve breathability and contact area.

[0043] The above adsorption member may be composed of a multi-stage adsorption member. For example, the adsorption member may include a front end member facing the exhaust gas flow and a rear end member adjacent thereto, and the front end member and the rear end member may be composed of different materials. For example, the front end member may include one selected from the group consisting of silica, zeolite 3A, and 4A, diatomaceous earth, and MOF, which are hydrophilic adsorbents that adsorb moisture well, and the rear end member may include, as a main component, a hydrophobic zeolite having a Si / Al molar ratio of 15 or more and a zeolite (USY, ZSM5, etc.) that adsorbs volatile organic compounds well while having a low relative adsorption capacity for moisture.

[0044] Figure 2 is a schematic drawing showing a cross-section of an adsorption member (10) of the present invention, conceptually showing that the adsorption member is divided into an adsorption region (A), a cooling region (C), and a desorption region (D).

[0045] In the present invention, the plurality of regions may be defined as areas in a direction substantially perpendicular to the gas flow flowing through the paths (①, ②, ③) described with reference to FIG. 1. For example, the area of ​​the region may be defined by a cross-sectional area perpendicular to the axis of the concentrator.

[0046] The above multiple regions may include functional regions such as, for example, an adsorption region (12), a desorption region (14), and a cooling region (16).

[0047] In the above-described adsorption member of the present invention, the areas occupied by the adsorption region (12), the desorption region (14), and the cooling region (16) can be appropriately divided. In general, the area of ​​the adsorption region (12) can preferably occupy 40% to 90% of the total area of ​​the adsorption member (10). Therefore, the adsorption region (12) can have a larger area than the desorption region (14) or the cooling region (16). In addition, the desorption region (14) and the cooling region (16) can be designed to have the same area, or the desorption region (14) can be designed to be smaller than the cooling region (16).

[0048] Preferably, the present invention may have a relationship of adsorption area > cooling area ≥ desorption area. Specifically, the cooling area / desorption area ratio in the present invention may be 1.05 or more, 1.1 or more, or 1.2 or more. In addition, the upper limit of the area ratio may be limited to 1.5, 2.0, or 3.0. An excessive area ratio exceeding this does not substantially affect the increase in energy recovery efficiency, and is therefore disadvantageous from an economic perspective.

[0049] The purge shown in Fig. 2 can be viewed as an enlarged portion of the cooling zone described above, but can also be considered as an additional zone other than the cooling zone. If the recirculation rate increases or the temperature and concentration of the concentrated gas coming from the desorption zone increase, a zone that can purge and cool or recover the temperature may be required. For this purpose, a purge zone can be added. At this time, the purge gas introduced into the purge zone can be one type of gas selected from outside air, exhaust gas, and purified exhaust gas, or a mixture of these gases. Here, the outside air can include clean atmospheric air, air with adjusted oxygen concentration, and, if the combustible material is a gaseous substance, inert gases such as non-reactive nitrogen, carbon dioxide, and helium.

[0050] In the present invention, the adsorption member (10) functions as a plurality of regions, such as an adsorption region (12), a desorption region (14), and a cooling region (16), when in operation, and these regions can be isolated or separated by a sealing means.

[0051] Meanwhile, as illustrated, the functional area of ​​the adsorption member (10) in the present invention may further include a purge area.

[0052] FIG. 3 is a schematic drawing showing an example of a gaseous substance treatment device for highly concentrating gaseous substances in a large-volume, low-concentration gaseous substance emission source according to one embodiment of the present invention.

[0053] Referring to FIG. 3, the gaseous substance treatment device includes a concentration device (100), a desorption means (200), and a concentrated gas treatment means (300).

[0054] Referring to FIG. 3, pollutants or harmful components, that is, gaseous substances, contained in the exhaust gas flowing in from the emission source are adsorbed on the adsorbent of the adsorption member (10) of the concentrator (100) while passing through the concentrator (100). The concentrator (100) is preferably a rotor-type adsorption and concentration means capable of controlling the rotational speed according to the concentration of the gaseous substances flowing in. In the present embodiment, the concentrator (100) can rotate at a rotational speed of 2 to 20 rph. In the present invention, the rotational speed of the concentrator is exemplary and may be set differently according to process conditions or process conditions. In addition, the operation method of the rotor type is such that adsorption, cooling, and desorption are repeatedly performed, and the rotation method of the rotor is not limited to whether it is continuous or intermittent.

[0055] As described above, the gaseous substance contained in the exhaust gas of the emission source flows into the concentrator (100) and is adsorbed on the adsorbent member (10) in the adsorption region (A). As the rotor rotates, the adsorbent member (10) that has adsorbed the gaseous substance enters the desorption region (B) and is desorbed by the desorption air. At this time, the desorption gas is used at a lower flow rate than the exhaust gas flowing into the adsorption region. Preferably, the desorption gas flow rate and the adsorption gas flow rate are 1 / 3 to 1 / 30. Accordingly, the desorption gas can contain a high concentration of gaseous substance 3 to 30 times that of the adsorbed gas. The flow rate of the exhaust gas flowing into the adsorption region and the flow rate of the desorption gas can be adjusted in ratio by adjusting the desorption gas transport means according to the concentration. However, if the amount of desorption gas is reduced too much, the desorption energy required for the desorption of the gaseous substance cannot be delivered, and thus desorption will not occur. Therefore, it must be appropriately adjusted.

[0056] Meanwhile, in the present invention, the exhaust gas from the emission source can be used as a cooling gas. In this case, as illustrated, a portion of the exhaust gas from the emission source branches off from the exhaust gas flow (①) and joins the cooling gas flow. The ratio of the flow of the branched cooling gas to the exhaust gas flow (①) determines the content of pollutant components in the desorbed gas, and therefore, this ratio can regulate the concentration multiple. For example, the ratio of the exhaust gas used as a cooling gas is determined by the amount of the desorbed gas and the recirculation rate. The flow rate ratio of (exhaust gas flow rate) / (desorbed gas flow rate) is not particularly limited, but must be an amount that can provide the energy required for desorption of the adsorbed gaseous substance. Generally, a flow rate of 3 to 30 times is mainly used in the field, and when the recirculation rate is 50% (i.e., when 50% of the desorbed gas is recirculated as a cooling gas), the flow rate ratio of (exhaust gas flow rate) / (branched cooling gas flow rate) increases to 6 to 60.

[0057] The concentration device of the present invention comprises a desorption means (200) for heating the desorption gas. In the present invention, the desorption means (200) may be a heating device such as a heater, microwave, or plasma (or plasma burner), or a vibration means such as an ultrasonic vibrator. Of course, the present invention is not limited thereto, and various desorption means may be used, but preferably, an electric heater, a burner, and high-temperature air are used as the heating device. When high-temperature air is used, a method of directly introducing it into the desorption gas flow or transferring heat energy through an indirect heat exchanger may be used.

[0058] As previously described with reference to Figure 1, a portion of the desorbed gas is branched off and rejoins the cooling gas flow. This branching mechanism may consist of a duct and a valve.

[0059] Figure 3 illustrates an example of a branching mechanism for desorption gas, including an exhaust duct (120) and a recirculation duct (130). In the present invention, the exhaust duct and the recirculation duct may be equipped with a flow control means such as a valve.

[0060] In the present invention, the exhaust gas recirculation stream (④) passing through the recirculation duct contains gaseous substances that are concentrated and have a high concentration compared to the exhaust gas stream (①). In the present invention, the concentration concentration can be determined according to the concentration multiple and the recirculation rate. For example, in the present invention, when the ratio of the desorbed gas to the exhaust gas of the emission source is 15 times [see Table 2], the concentration concentration can be increased up to 300 times by changing the circulation rate from 5 to 95%, and when the actual treatment rate is considered to be 95%, it is 0.25 g / Nm 3 The exhaust gas is 71.262 g / Nm 3 It can be concentrated to obtain a concentration of up to 285 times.

[0061] Therefore, the cooling gas stream (②) mixed with the concentrated exhaust gas in this way contains a high concentration of gaseous substances.

[0062] The cooling gas flow (②) is heated by the desorption means (200) and flows into the desorption area (B) of the adsorption member (10) to desorb the adsorbed gas, thereby making the desorbed gas flow (③) more concentrated. In this way, the concentration of pollutants in the exhaust gas recirculation flow (④), cooling gas flow (②), and desorbed gas flow (③) increases due to repetition of adsorption, cooling, and desorption, and after several repetitions, reaches a certain concentration selected by the operator, i.e., an equilibrium concentration.

[0063] Combustible materials pose a risk of fire or explosion in the presence of oxygen. Therefore, they should be managed below their LEL. However, to ensure safety, it is recommended to maintain a level of 25% of the LEL. Since the LEL varies with ambient temperature, its influence on temperature should also be considered when determining the LEL. However, in cases where this risk is not present, it is permissible to set the LEL at a concentration suitable for condensation, recovery, and oxidation.

[0064] In general, when desorption is performed by applying heat, the temperature of the desorption gas must be higher than the adsorption temperature, and the temperature is preferably 100 to 300°C. The desorption gas temperature may vary depending on the gaseous substance to be adsorbed and the characteristics of the adsorption material.

[0065] Meanwhile, in order to use the desorbed gas as a recirculating stream in the present invention, some or all of the desorbed gas may be heat-exchanged. For example, when desorbing at a gas temperature of 220°C, the gas concentrated after desorption transfers heat to the member of the desorption area and is discharged at a temperature of approximately 40 to 100°C or lower. However, when this gas is recirculated, the temperature of the cooling gas may rise somewhat, so in this case, the temperature of the desorbed and recirculated gas needs to be lowered. At this time, various means such as an air-cooled heat exchanger, a water-cooled heat exchanger, and a refrigerator can be used as a cooling means, but a water-cooled heat exchanger type is generally preferred. In addition, in the present invention, the heat exchanger may be installed in a branched flow path for recirculation, or, in the case of cooling, condensation, or recovery, may be installed before the circulated gas and the discharged gas are diverged.

[0066]

[0067] By the above mechanism, the low-concentration gaseous substance of the exhaust gas flow (①) of the initial emission source is introduced into the concentrator, and as the concentrator rotor rotates, the gaseous substance is repeatedly adsorbed → desorbed → cooled → desorbed → cooled → desorbed in that order, so that the exhaust gas flow can be gradually concentrated into a high-concentration gaseous substance.

[0068] In the present invention, the concentration of the circulated exhaust gas is higher than the concentration of the inflow, and the temperature and concentration of the cooling gas are higher than in the case where it is not circulated due to the heat transferred during the desorption process. At this time, the exhaust gas with high concentration remains in the adsorption member and when it passes to the adsorption area, it may escape immediately without being adsorbed in the adsorption area. Although the effect caused by this is not large, a purge section that does not include the circulated exhaust gas can be provided to eliminate the effect and lower the temperature. As shown in Fig. 2, the purge section (18) can be used by introducing outside air, exhaust gas from the emission source, or purified gas into the purge section. Here, the outside air may include clean atmospheric air, air with adjusted oxygen concentration, or inert gases such as non-reactive nitrogen, carbon dioxide, and helium when the combustible substance is a gaseous substance.

[0069]

[0070] In this case, the gas streams passing through the cooling zone and the purge zone can be separated or combined. Since the gases passing through the cooling zone and the purge zone can be mixed, heated by a heating means, and then introduced into the desorption zone, they do not necessarily need to be separated into separate compartments. In other words, since the gas passing through the purge zone contains gaseous substances, there are methods for sending it as a desorption stream, sending it to an adsorption zone, or sending it directly to a final processing means for gaseous substances, but sending it as a desorption stream is the most preferable method.

[0071] When using the purge region, gaseous substances can be concentrated by sequentially switching in the order of adsorption → desorption → cooling → purge → adsorption → desorption → cooling → purge.

[0072] In the present invention, the concentration ratio of gaseous substances in the exhaust gas can be controlled by the percentage of the flow rate of the recirculation flow (④) to the flow rate of the desorption gas flow (③), i.e., the recirculation rate. In the present invention, the recirculation rate can be controlled according to the concentration of gaseous substances in at least one of the exhaust gas flow flowing into the adsorption member from the emission source, the recirculation gas flow flowing into the adsorption member (cooling region), and the gas flow passing through the adsorption member. In the present invention, the recirculation rate can be from 1 to 99.9%, but preferably from 5 to 95%. For example, the recirculation rate can be 5% or more, 10% or more, 15% or more, or 20% or more. In addition, the recirculation rate can be 95% or less, 90% or less, 85% or less, or 80% or less.

[0073] For example, the concentration of gaseous substances introduced or recirculated can be designed to be maintained below the lower explosive limit (LEL) that explodes due to the introduction of oxygen. Preferably, the present invention is designed to control the recirculation flow (④) and the desorbed gas flow (③) at a constant ratio in consideration of safety, since the temperature of the exhaust gas containing combustible vapor that can explode is not constant, and to maintain the concentration at 1 / 4 to 1 / 5 of the lower explosive limit. For example, in the case of Table 1, the lower explosive limit of toluene is 52.2 g / Nm 3 and 1 / 4 of this is 13.05 g / Nm 3 If the concentration is 13.05 g / Nm 3 If you want to control it below, the concentration is 0.25 g / Nm 3 In this case, if the recycling rate is 80%, it is 14.263 g / Nm 3 Since concentration is possible up to 0.5 g / Nm, a smaller value is set and the concentration is 0.5 g / Nm. 3 If 60% is recycled, 14.275 g / Nm 3 Since concentration is possible up to this point, it is desirable to set a lower recirculation rate.

[0074] The device of the present invention may be equipped with a concentration sensor (150) for measuring the concentration of gaseous substances in order to control the recirculation rate. In Fig. 3, the concentration sensor is installed upstream of the adsorption area of ​​the adsorption member (10) in the exhaust gas flow, but this is exemplary, and the concentration sensor may be installed on an appropriate flow path before the flow into the adsorption member (10) of the concentrator. Of course, the concentration sensor may be installed on the flow path of the desorption gas flow, or may be installed on all of the flow paths upstream of the adsorption member, the desorption gas flow path, and the cooling gas flow path. In addition, an additional concentration sensor (160) may be installed on the gas flow path passing through the adsorption member. This downstream concentration sensor (160) is for controlling the adsorption efficiency so that the concentration at the downstream of the adsorption member does not increase above a certain level.

[0075] Referring again to FIG. 3, the concentrated gas treatment means (300) may be a condensation recovery device through cooling and pressurization, a second concentration recovery device using an adsorbent and an absorbent, or an oxidation device such as an RTO, RCO, or RO that removes polluted gases through combustion. In addition, when a condensation recovery device is used in the present invention, the primary treated gas recovered by the condensation recovery device may be supplied again to the adsorption area or cooling area of ​​the adsorption member to perform additional purification.

[0076] In the concentration device of Fig. 3, the concentration multiple is fixed at 12 times, and the concentration of the pollutant component according to the recirculation rate (equilibrium concentration, g / Nm 3 ) is calculated as shown in Table 1 below (concentration multiple 12 times). At this time, the inlet concentration of the exhaust gas stream emitted from the emission source containing oxygen is changed to 0.25 to 1.0 g / Nm3, and the concentration of pollutants according to the recirculation rate (g / Nm 3) was calculated. The concentration of the pollutant was calculated as the saturation concentration when repeated several times. Toluene was assumed as the pollutant, the LEL was 1.27%, and the stability standard was 1 / 4 of the LEL. The temperature effect of the LEL was ignored. In addition, the treatment rate was assumed to be 95%. In Table 1 below, the left column shows the recirculation rate (%), and the right row shows the inlet concentration (g / Nm 3 ) is indicated.

[0077] Classification 0.250.50.75195%57.013114.025171.038228.05080%14.26328.52542.78857.05060%7.13814.27521.41328.55040%4.7639.52514.28819.05020%3.5757.15010.72514.3005%3.0136.0259.03812.0500%2.8635.7258.58811.450

[0078] From the table above, it can be seen that the equilibrium concentration of toluene gradually increases as the recirculation rate increases from 0 to 95%. Meanwhile, when the concentration ratios are 15 times and 6 times, respectively, and the remaining conditions are the same, the results of calculating the equilibrium concentration are as shown in Table 2 (concentration ratio 15 times) and Table 3 (concentration ratio 6 times) below.

[0079] Classification 0.25 0.5 0.75 195% 71.26 21 42.5 25 21 3.78 8 28 5.05 0 80% 17.8 25 35 65 0 53.47 57 1.30 0 60% 8.9 19 17.83 8 26.75 635 67 5 40% 5.9 5 0 11.9 0 17.85 0 23.80 0 20% 4.46 68 93 113.39 7 17.86 35% 3.76 37.5 25 11.28 8 15.05 00% 3.57 5 7.15 0 10.72 5 14.300

[0080] Classification 0.511.5295%57.025114.050171.075228.10080%14.27528.55042.82557.10060%7.15014.30021.45028.60040%4.7759.55014.32519.10020%3.5887.17510.76314.3505%3.0256.0509.07512.1000%2.8755.7508.62511.500

[0081] Figure 4 is a drawing showing a second embodiment having a branching mechanism for desorption gas.

[0082] Referring to Fig. 4, in addition to the exhaust duct (120) and the first recirculation duct (130A) described with reference to Fig. 3, a second recirculation duct (130B) is provided. In the present invention, the exhaust duct (120) and the recirculation ducts (130A, 130B) may be provided with a flow control means such as a valve. Here, the connection part of the second circulation duct (130B) may be installed at any position in the flow path of the exhaust gas flow. It may be installed before or after the cooling gas flow (②) branches from the exhaust gas flow (①), and the number of installations is not limited.

[0083] In the present invention, the second exhaust gas recirculation stream (⑦) passing through the recirculation duct includes a gaseous substance that is concentrated and has a high concentration compared to the exhaust gas stream (①). In the present invention, the concentration concentration can be determined according to the flow rate ratio of the concentrated effluent and the concentrated gas to be recirculated. In addition, the concentration concentration can also be determined by the ratio of the first exhaust gas recirculation stream (⑦) and the second exhaust gas recirculation stream (⑤). When the second exhaust gas recirculation stream (⑦) is installed as in the present embodiment, the temperature of the cooling gas stream can be prevented from rising, and the amount of the gas stream supplied to the final treatment means can be controlled, thereby having the advantage of stably maintaining the treatment capacity of the final treatment means.

[0084] In this embodiment, a portion of the second exhaust gas recirculation stream (⑦) may be joined to the exhaust gas stream (①), and another portion may be joined to the cooling gas stream, thereby increasing the concentration of pollutants in the desorbed gas. The concentration of pollutants in the first exhaust gas recirculation stream (④), the second exhaust gas recirculation stream (⑦), the cooling gas stream (②), and the desorbed gas stream (③) increases through repetition of adsorption, cooling, and desorption, and after several repetitions, reaches a constant concentration selected by the operator, i.e., an equilibrium concentration.

[0085] Figure 5 is a drawing showing a third embodiment having a branching mechanism for desorption gas.

[0086] Referring to Fig. 5, in addition to the exhaust duct (120) and the first recirculation duct (130A) described with reference to Fig. 3, a third recirculation duct (130C) is provided. In the present invention, the exhaust duct (120) and the recirculation ducts (130A, 130C) may be provided with a flow control means such as a valve.

[0087] In the present invention, the third exhaust gas recirculation flow (⑧) passing through the third recirculation duct (130C) is concentrated compared to the cooling gas flow (②) and contains a gaseous substance with a high concentration. In the present invention, the concentration concentration can be determined according to the flow rate of the concentrated drainage and the concentrated gas to be recirculated. In addition, the concentration concentration can also be determined by the ratio of the first exhaust gas recirculation flow (④) and the third exhaust gas recirculation flow (⑧).

[0088] When the third exhaust gas recirculation flow (⑧) is used as in this embodiment, the temperature rise of the cooling gas flow can be controlled, as in the embodiment of Fig. 4, and desorption energy can be added by increasing the amount of desorption gas, which has an advantage in desorption. The third recirculation duct (130C) can be installed at any position in the gas flow path from the outlet of the cooling zone to the inlet of the desorption zone, but it is preferably installed in front of the desorption means (200). In addition, when an external high-temperature air (waste heat or heated air) flow is brought in as desorption air, the third exhaust gas recirculation flow (⑧) can be supplied mixed with the high-temperature air flow.

[0089] The third exhaust gas recirculation flow (⑧) joins the cooling gas flow (②) and flows into the desorption area (B) of the adsorption member (10) to desorb the adsorbed gas, thereby making the desorbed gas flow (③) more concentrated. Meanwhile, the concentration of pollutants in the first exhaust gas recirculation flow (④), the third exhaust gas recirculation flow (⑧), the cooling gas flow (②), and the desorbed gas flow (③) increases due to repetition of adsorption, cooling, and desorption, and after several repetitions, reaches a certain concentration selected by the driver, i.e., an equilibrium concentration.

[0090] Figure 6 is a drawing showing a fourth embodiment having a branching mechanism for desorption gas.

[0091] Referring to Fig. 6, it can be seen that the exhaust duct (120) and the first recirculation duct (130A) described with reference to Fig. 3 are combined with a second recirculation duct (130B) and a third recirculation duct (130C). In the case of this embodiment, it can have the advantage of being able to appropriately control the temperature of the cooling gas flow, stably maintain the flow rate of the final treatment means, and stably provide the desorption energy required for desorption.

[0092] Meanwhile, although FIGS. 4 to 6 illustrate that the second exhaust gas recirculation flow and / or the third exhaust gas recirculation flow coexist with the first exhaust gas recirculation flow, the second exhaust gas recirculation flow or the third exhaust gas recirculation flow may be provided without the first exhaust gas recirculation flow. Furthermore, the present invention may provide two or more of the first exhaust gas recirculation flow, the second exhaust gas recirculation flow, and the third exhaust gas recirculation flow as recirculation flows.

[0093] The present invention can be applied to a device for concentrating and processing gaseous substances such as odors, carbon dioxide, and volatile organic compounds.

Claims

1. A concentrating device for concentrating a gaseous substance, comprising an adsorption member forming a plurality of functional areas for adsorbing and concentrating and desorbing gaseous substances in exhaust gas emitted from an emission source, and a driving unit for relatively rotating the adsorption member with respect to the gaseous substance. The plurality of functional regions of the above adsorption member include an adsorption region, a desorption region, and a cooling region, The above concentration device, It includes an exhaust gas path flowing into the adsorption area from the emission source, a desorption gas path discharging concentrated gas from the desorption area, a cooling gas path flowing into the cooling area, and a recirculation path branching from the desorption gas path. A gaseous substance concentration device characterized in that a portion of the concentrated gas of the desorption gas path joins the exhaust gas path through the recirculation path.

2. In paragraph 1, A gaseous substance concentration device characterized in that another portion of the concentrated gas of the above desorption gas path joins the cooling gas path flowing into the above cooling region.

3. In paragraph 2, A gaseous substance concentration device characterized in that another portion of the concentrated gas of the above desorption gas path joins the desorption gas path flowing into the desorption area.

4. A concentrating device for concentrating a gaseous substance, comprising an adsorption member forming a plurality of functional areas for adsorbing and concentrating and desorbing gaseous substances in exhaust gas emitted from an emission source, and a driving unit for relatively rotating the adsorption member with respect to the gaseous substance. The plurality of functional regions of the above adsorption member include an adsorption region, a desorption region, and a cooling region, The above concentration device, It includes an exhaust gas path flowing into the adsorption area from the emission source, a desorption gas path discharging concentrated gas from the desorption area, a cooling gas path flowing into the cooling area, and a recirculation path branching from the desorption gas path. A gaseous substance concentration device characterized in that a portion of the concentrated gas of the above desorption gas path joins the desorption gas path that flows into the desorption area through the above recirculation path.

5. In paragraph 4, A gaseous substance concentration device characterized in that another portion of the concentrated gas of the above desorption gas path joins the above exhaust gas path.

6. In paragraph 1 or paragraph 4, The functional area of ​​the above adsorption member further includes a fuzzy area, A gaseous substance concentration device characterized in that it further includes a purge path for introducing purge gas into the above purge area.

7. In paragraph 4 A gaseous substance concentration device characterized in that the purge gas comprises outside air, exhaust gas or purified exhaust gas.

8. In paragraph 4 A gaseous substance concentration device characterized in that the above external air contains atmospheric air, air with controlled oxygen concentration, carbon dioxide, nitrogen or an inert gas.

9. In paragraph 1 or paragraph 4, A gaseous substance concentration device characterized in that a cooling means is provided in the above recirculation path.

10. In paragraph 1 or paragraph 4, A gaseous substance concentration device characterized in that a cooling means is provided in the above desorption gas path.

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